"Before taking office people were assuming that we were going to war with North Korea," he said on Twitter as Air Force One touched down in the US, adding,"President Obama said that North Korea was our biggest and most dangerous problem, no longer - sleep well tonight!"

Before taking office people were assuming that we were going to War with North Korea. President Obama said that North Korea was our biggest and most dangerous problem. No longer - sleep well tonight!

President Trump and North Korean leader Kim Jong-un had met at the Capella hotel in Singapore for a face-to-face summit to resolve differences as Kim pledged to "denuclearise" the Korean Peninsula and bring hostilities with its neighbour South Korea to an end.

Just landed - a long trip, but everybody can now feel much safer than the day I took office. There is no longer a Nuclear Threat from North Korea. Meeting with Kim Jong Un was an interesting and very positive experience. North Korea has great potential for the future!

Earlier the President had said the world had taken a "step back" from potential nuclear catastrophe, asserting that there wouldn't be anymore "rocket launches, nuclear testing or research" referring to North Korea's peace moves during the Singapore summit.

"I want to thank chairman Kim for taking the first bold step toward a bright new future for his people," the US president said in his tweet, while saying that it was an "unprecedented meeting" "the first between an American President and a leader of North Korea – proves that real change is possible!

"There is no limit to what North Korea can achieve," he noted.

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President Trump and North Korean leader Kim Jong-un had met at the Capella hotel in Singapore for a face-to-face summit